Fttknace-gbate



P. SCHERMAN.

FURNACE GRATE.

APPLICATION men DEC 11. 1915.

1 ,303 ,1 1 9. Patented May 6, 1919.

- 3 SHEETS-SHEET 2.

Invent o1;

P. SCHERMAN.

FURNACE GRATE.

APPLICATION FILED DEC II, 1915.

1,303,]. 19. v Patented May 6, 1919.

3 SHEETS-SHEET 3.

1 8 2:; JBEZWM UNITED STATES PATENT ornrcE.

PETER SGHERMAN, OF FORT ATKINSON, WISCONSIN.

FURNACE-GRATE.

Specification of Letters Patent.

Patented May 6, 1919.

Application filed. December 17, 1915. Serial No. 67,375.

of cooling the bars, facilitating combustion,

and driving the flames and products of combustion in a direction to secure maximum heating efficiency.

In the drawings Figure 1 is a fragmentary plan view of a furnace or fuel grate embodying my invention.

Fig. 2 is a sectional view of the same, drawn on line a;m of Fig. 1.

Fig. 3 is a sectional view, drawn on line y 4 of Fig. 2.

Fig. 4 is a fragmentary plan view showing a modified form of end plate.

Fig. 5 is a vertical sectional view, drawn to a plane cutting the valve slide and air ports.

Fig. 6 is a transverse sectional view, drawn to a vertical plane cutting one of the air ports.

Fig. 7 is a detail view of one of the valve slides.

Like parts are identified by the same reference characters throughout the several views.

The grate proper illustrated in the drawings may be of ordinary construction, the frame having end plates A and oscillatory grate bars B, the latter being journaled in the side bars C of the frame and also in center frame bars D, where the furnace is so large as to require intermediate supports. The grate bars 13 are provided with downwardly projecting arms B which are connected with shaking bars B, the latter being loosely connected with a shaking lever I) located at the front of the furnace. These parts being of ordinary construction require no further description.

In my improved construction, however, a pipe E extends along the under side of the plate A and is provided with a series of upwardly projecting branch pipes E, which extend through apertures in the plates A and are adapted to deliver jets of air or steam upwardly through the plates in the direction of the arch. The air or steam is supplied to the pipe E from the exterior through a main supply pipe F.

An extension F of the pipe F projects rearwardly underneath the central portion of the grate. In the construction shown, the axis of this extension F is below the space between the frame bars D, D. This extension or branch pipe F, is provided with a series of apertures through which jets of air or steam may escape in an upward direction between the bars D, D. e

The extension F is also provided with lat eral branches G and these branches also have jet openings 9 at intervals. The branches are located with their axes directly below the spaces between the bars of oscillatory grate bars B, so that the jets of air or steam escaping through the openings 9 will pass upwardly between the grate bars B and be delivered directly into the fuel.

I attach considerable importance to the arrangement of the pipes and jet apertures with reference to the various elements of the grate. The jets delivered from pipe E through the ducts E cool the plate A, protect the arch and drive the fire under the boiler. The jets from the rearwardly extending pipe F divides the fire so that it will not strike directly on the middle of the boiler.

The jets deflect the flames toward the respective sides of the boiler, thereby distributing the heat more uniformly over the heat absorbing surfaces. The branch pipes G will deliver air or steam directly into the fuel and thereby greatly promote combustion. Any desired number of these branch pipes may be employed.

It will of course be understood that combustion will be promoted by all the jets of air or steam, the size of the openings and the force or pressure of the air or steam being regulated to suit the requirements of the furnace. But with the described arrangement of the jets, I am able to not only utilize them for the purpose of promoting combustion, but for the additional purpose of uniformly distributing the heat and to protect those stationary grate bars which would otherwise be most subject to excessive temperatures from being heated to the point where deterioration will result.

Referring to Figs. 4 to 7 inclusive, it will be observed that I have provided means for covering the jet ports when it is desired to prevent ashes, cinders or small pieces of coal from lodging therein. For example, the

hand plate A A, similar to the plate A.-

provided with a series of'apertures P which may be moved by means of the arm Q into and out of registry with the outlets of the branch pipes E. The bar P is therefore adapted to serve as a slide valve, whereby the outlets of the branch pipes E may be opened or closed at pleasure. When feeding fuel into the furnace or when for any reason it isnot desired to deliver air through this end plate, the slide valve may be closed, thereby preventing ashes or small particles of coal or cinders from lodging in the ducts.

I claim l. The combination with a fuel grate provided with a stationary end plate, of a main supply pipe for air or steam, branch pipes leading therefrom and provided with ducts leading through the end plate of the grate, another branch pipe leading rearwardly underneath the central portion of the grate and provided with openings through which air or steam may be injected upwardly through the rate along the center line.

2. The com ination with a fuel grate pro vided with a stationary end plate, of a main supply pipe for air or steannbranch pipes leading therefrom and provided with ducts leading through the end plate of the grate, another branch pipe leading rearwardly underneath the central portion of the grate and provided with openings through which air or steam may be injected upwardly through the grate along the center line, and auxiliary branch pipes extending laterally from intermediate points in said central branch pipes and having jet apertures for delivery of air or steam upwardly through the grate, substantially as described.

3. A furnace grate provided with sets of oscillatory grate bars, an apertured stationary end plate and spaced central supporting bars for the inner ends of the oscillatory grate bars, in combination with a set of pipes for air or steam extending underneath the grate bars, and through which air or steam may be ejected through said end plate and between the oscillatory bars and also'between the central supporting bars, substantially as described.

4C. A furnace grate provided with longitudinally extending bearing bars extending from the fuel receiving end rearwardly, two sets of grate bars transversely arranged and supported at their inner ends upon said bearing bars, and a blast pipe located underneath said bars, and provided with apertures through which air or steam may be delivered in a substantially continuous sheet through the aperture formed by said bars to divide the flames and products of combustion and force them toward the sides of the combustion chamber, said blast pipe being provided with medial branches extending transversely thereto below the spaces between the grate bars, and apertured to deliver air or steam between the middle grate bars and deflect the flames toward the front and rear of the combustion chamber.

In testimony whereof I affix my signature in the presence of two witnesses.

PETER SCHERMAN.

Witnesses:

V. D. James, GEO. LOI-IMAIN.

Copies 01' this patent may be obtained for nve cents each, by addressing the Commissioner of Patents.

Washington, D. G. I

having apertures I 

